MINA: At least 150 pilgrims were killed on Thursday in a crush at Mina, outside the Muslim holy city of Makkah, where some two million people are performing Haj, Saudi Arabia's civil defence directorate reported.

Rescue operations are under way, the civil defence service said on Twitter.

An emergency has been declared in all nearby hospitals.

The Haj pilgrimage was undeterred by a crane collapse in Makkah earlier this month that killed 109 people and injured near Islam's holiest site.

Previously marred by stampedes and fires that killed hundreds, Haj had been largely incident-free for the past decade after safety improvements.

At least 220 people killed, 450 injured in stampede during Hajj outside Mecca

The incident occurred outside the holy city of Mecca where some two million people are performing the annual Hajj pilgrimage.

Scene of the stampede Image Courtesy: Twitter

At least 150 pilgrims were killed on Thursday in a crush at Mina, outside the Muslim holy city of Mecca, where some two million people are performing the annual Hajj pilgrimage, Saudi Arabia's civil defence authority said.

The crush, in which at least 400 others were injured, took place on Street 204 of the camp city at Mina, a few kilometres east of Mecca, where pilgrims stay for several days during the climax of the Hajj.

Thursday is also Eid al-Adha, when Muslims slaughter a sheep. It has traditionally been the most dangerous day of Hajj because vast numbers of pilgrims attempt to perform rituals at the same time in a single location.

Street 204 is one of the two main arteries leading through the camp at Mina to Jamarat, where pilgrims ritually stone the devil by hurling pebbles at three large pillars. Photographs published on the civil defence Twitter feed showed pilgrims lying on stretchers while emergency workers in high-visibility jackets lifted them into an ambulance.

"Work is underway to separate large groups of people and direct pilgrims to alternative routes," the Saudi Civil Defence said on its Twitter account. The pilgrimage, the world's largest annual gathering of people, has been the scene of deadly stampedes in the past, as well as other disasters including tent fires and riots. However, massive infrastructure upgrades and extensive spending on crowd control technology over the past two decades had made such events far less common.